Copying a selection in a QTableView properly (model index issues)

I have a QTableView that displays parsed data from a file. I open the file, parse it into different columns based on its delimiter for each line in the file, and then output it to the view. I am using a QStandardItemModel for this.

Relevant code that sets up the model:

QStandardItemModel* model = new QStandardItemModel(this);

int lineIndex = 0;
QStringList headers;
headers << "Col1" << "Col2";
model->setHorizontalHeaderLabels(headers);
file.seek(0);
QTextStream inData(&file);
while (!inData.atEnd()){
  QString line = inData.readLine();
  QStringList lineToken = line.split(":"/*, QString::SkipEmptyParts*/);
  for (int j = 0; j < lineToken.size(); j++) {
    QString value = lineToken.at(j);
    QStandardItem* item = new QStandardItem(value);
    model->setItem(lineIndex, j, item);
  }
lineIndex++;

}
ui->tableView->setModel(model);
ui->tableView->horizontalHeader()->setSectionsMovable(true);

Note that I have it so that I can drag the column headers around to reorder the columns in the table. This will be important later.

I also have the view set up so that I can select an entire row (or individual cells), hit Ctrl+C, and have the contents of the selection copy to the clipboard. I made a separate model for the selected items/rows:

QApplication::clipboard()->clear();
QItemSelectionModel* selection = ui->tableView->selectionModel();
QModelIndexList indexes = selection->selectedIndexes();

QString clipboardString;
QModelIndexList selectedIndexes = ui->tableView->selectionModel()->selectedIndexes();

I then have some code to handle what happens if the selection spans multiple rows. I set up a QModelIndex for this. The implementation for this is simple. I use a for loop to iterate through the indices of the selected cells. If the next index (column) is on the same row as the current one, I add that data to the variable I will eventually write to the clipboard and append a tab (t) to it (since I want the copied cells to be delimited by tabs so I can easily copy to the clipboard and paste into Excel if I want). If the next index (column) is on a DIFFERENT row, then I append a line break (n). Here is the code:

for (int i = 0; i < selectedIndexes.count(); ++i)
{
  QModelIndex current = selectedIndexes[i];
  QString displayText = current.data(Qt::DisplayRole).toString();
  // If there exists another column beyond this one.
  if (i + 1 < selectedIndexes.count()) {
    QModelIndex next = selectedIndexes[i+1];
    // If the column is on different row, the clipboard should take note.
    qDebug() << "next.row()" << next.row();
    qDebug() << "current.row()" << current.row();
    if (next.row() != current.row()){
      displayText.append("n");
    } else {
      // Otherwise append a column separator.
      displayText.append("t");
    }
  }
    clipboardString.append(displayText);
}
QApplication::clipboard()->setText(clipboardString);

Here's where I have a problem. If I rearrange the columns in my view, the index check breaks. My untouched view looks like this:

+------+------+
| Col1 | Col2 |
+------+------+
| A    | B    |
| W    | X    |
+------+------+

If I select any of the values in the table, I can Ctrl+C and paste as expected. No problem. A copy and paste after selecting this entire table would result in this output:

A   B
W   X

However, if I drag Col1 over to where Col2 is, effectively switching them to look like this:

+------+------+
| Col2 | Col1 |
+------+------+
| B    | A    |
| X    | W    |
+------+------+

...and select the entire thing and paste it, I get this output:

B
X
A
W

This is obviously not what I want and it seems to be adding a line break (n) after every selected cell.

My qDebug() outputs for the first, unmodified table are:

next.row() 0
current.row() 0
next.row() 1
current.row() 0
next.row() 1
current.row() 1

My qDebug() outputs for the second, rearranged table are:

next.row() 1
current.row() 0
next.row() 0
current.row() 1
next.row() 1
current.row() 0

What am I doing wrong here? Why would it matter that the columns in the view are rearranged?